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Your search keyword '"Shiori Takeda"' showing total 5 results
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5 results on '"Shiori Takeda"'

1. A clickable caging group as a new platform for modular caged compounds with improved photochemical properties

Author

Tomomi Hamaguchi, Ryosuke Aikawa, Toshiaki Furuta, Yukiko Shiraishi, Hiroyuki Okuno, Shiori Takeda, Ryota Sekine, Akinobu Z. Suzuki, and Hirokazu Tamamura

Subjects
010405 organic chemistry, business.industry, Chemistry, Photodissociation, Metals and Alloys, General Chemistry, Modular design, 010402 general chemistry, Photochemistry, 01 natural sciences, Catalysis, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Group (periodic table), Materials Chemistry, Ceramics and Composites, Molecule, Clickable, business
Abstract

A 6-bromo-7-hydroxycoumarin-4-ylmethyl (Bhc) caged compound having a click-modifiable chemical handle was designed and synthesized. This molecule was applied to the synthesis of modular caged paclitaxels (PTXs) in which additional functional units could be easily installed. This system was used to prepare water-soluble caged PTXs with improved photolysis efficiencies.

Published
2019

2. Central zinc metal-controlled regioselective meso-bromination of zincatedβ-silylporphyrins-rapid access to meso,β-dual-functionalized porphyrins

Author

Satoshi Hayashi, Masahiro Noji, Rina Takamatsu, Toshikatsu Takanami, and Shiori Takeda

Subjects
chemistry.chemical_compound, Silylation, Chemistry, Organic Chemistry, Polymer chemistry, Synthon, Rapid access, Zinc metal, Halogenation, Regioselectivity, Physical and Theoretical Chemistry, Biochemistry, Porphyrin
Abstract

A convenient method for the preparation of meso,β-dual-functionalized porphyrin was developed. The bromination of zincated β-silylporphyrin with NBS selectively yielded meso-bromo-β-silylporphyrin, whereas, the bromination of free-base β-silylporphyrin selectively yielded β-bromoporphyrin via an ipso-substitution of the silyl group. These meso,β-dual-functionalized porphyrins could be used as multipurpose synthons for fabricating various porphyrin derivatives.

Published
2020

3. Total Synthesis of (+)-Gliocladin C Based on One-Pot Construction of a 3a-(3-Indolyl)pyrroloindoline Skeleton by Sulfonium-Mediated Cross-Coupling of Tryptophan and Indole

Author

Nozomi Saito, Masanori Tayu, Shiori Takeda, Yi Hui, Kazuhiro Higuchi, and Tomomi Kawasaki

Subjects
Indole test, 010405 organic chemistry, Sulfonium, Stereochemistry, Organic Chemistry, Tryptophan, Total synthesis, 010402 general chemistry, 01 natural sciences, Biochemistry, Gliocladin C, 0104 chemical sciences, chemistry.chemical_compound, chemistry, Physical and Theoretical Chemistry, Derivative (chemistry)
Abstract

Total synthesis of (+)-gliocladin C has been achieved on the basis of one-pot construction of the 3a-(3-indolyl)pyrroloindoline core structure by the cross-coupling of a tryptophan derivative and an indole promoted by a sulfonium species generated from dialkylsulfoxide and triflic anhydride.

Published
2017

4. Chiroptical Protocol for the Absolute Configurational Assignment of Alkyl-Substituted Epoxides Using Bis(zinc porphyrin) as a CD-Sensitive Bidentate Host

Author

Masahiro Noji, Shiori Takeda, Satoshi Hayashi, and Toshikatsu Takanami

Subjects
chemistry.chemical_classification, Circular dichroism, Denticity, 010405 organic chemistry, Stereochemistry, Zinc ion, Organic Chemistry, Epoxide, 010402 general chemistry, 01 natural sciences, 0104 chemical sciences, Zinc porphyrin, chemistry.chemical_compound, chemistry, Chirality (chemistry), Lone pair, Alkyl
Abstract

The absolute configurations of simple alkyl-substituted chiral epoxides not bearing other ligating groups are readily determined via the exciton-coupled circular dichroism (ECCD) protocol using bidentate bis(zinc porphyrin) host system BP1 as a CD-sensitive chirality probe. In this situation, chiral epoxides can successfully be incorporated into the cleft of V-shaped host BP1 by double coordination of both oxygen lone pairs of the guest to the two central zinc ions of the host. We also propose a working model based on an MM2 optimized structure of the substrates that enables nonempirical prediction of the chirality of the bound epoxide.

Published
2018

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